Included -std=gnu90 option in compilation flags to fix compilation on GCC version >=5 #58
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Compilation using newest versions (5+) of GCC was giving an error while using GCC <=4 was working fine.
According to https://stackoverflow.com/a/14737642/1152602 , in GCC 5 the default was changed from -std=gnu90 to -std=gnu11.
Among other things this changes the behavior of the "inline" directive, which was giving errors due to function file_close in file.c.
By adding the flag -std=gnu90, behavior from old GCC is restored and the project compiles succesfully.
Tested on Xubuntu 17.04, gcc (Ubuntu 6.3.0-12ubuntu2) 6.3.0 20170406.